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You searched for: mediatype:movies AND collection:wellcomefilm AND subject:"Environmental Health"		Advanced search
[movies]Sewage disposal - Wellcome Film
Outline of domestic collecting system disposal into the sea direct, via tidal storage tanks. Purification by Imhoff tank and sprinkling filters. Purification by sand filtration. 2 segments.
Keywords: Environmental Health; Sewage; Waste treatment; Environmental Health; Sewage; Health care personnel
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